CN109188456A - A kind of accurately target materials identifying system - Google Patents
A kind of accurately target materials identifying system Download PDFInfo
- Publication number
- CN109188456A CN109188456A CN201811033856.3A CN201811033856A CN109188456A CN 109188456 A CN109188456 A CN 109188456A CN 201811033856 A CN201811033856 A CN 201811033856A CN 109188456 A CN109188456 A CN 109188456A
- Authority
- CN
- China
- Prior art keywords
- apd
- signal
- photon
- photoelectron
- target materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
Abstract
The invention discloses a kind of accurately target materials identifying systems, comprising: polarized light emission system and polarization optical detection system；Wherein, the polarized light emission system includes: the pulse laser, optical splitter and emission system set gradually；And the PIN detector being connected with the optical splitter；The polarization optical detection system includes: sequentially connected reception system, four road Stokes photon Polarization Detection systems, photon counter data acquisition system and data processing system；Wherein, the PIN detector is connected with the photon counter data acquisition system, and the Stokes vector of reflection photon is calculated using the Photon count statistic that Gm-APD measurement obtains, and achievees the purpose that target materials identify by the situation of change of Stokes vector.
Description
Technical field
The present invention relates to laser radar detection technical field, more particularly to a kind of accurately target materials are identified
System.
Background technique
With the continuous development of science and technology, there are increasingly higher demands for the distance of target acquisition, precision at present.Mesh
Before, the Material Identification to distant object is also the hot spot of research, can be effective by the polarization characteristic of target reflection echo
Man-made target and natural target are distinguished, improves laser radar for the recognition capability of camouflaged target.But work as target range
When farther out, the specific material of target may can not be recognized accurately as low as single photon magnitude in the intensity of light.
Therefore, how to provide a kind of detection system that target materials are recognized accurately is those skilled in the art's urgent need to resolve
The problem of.
Summary of the invention
In view of this, being obtained the present invention provides a kind of accurately target materials identifying system using Gm-APD measurement
Photon count statistic calculates the Stokes vector of reflection photon, reaches target materials identification by the situation of change of Stokes vector
Purpose.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of accurately target materials identifying system, comprising: polarized light emission system and polarization optical detection system；
Wherein, the polarized light emission system includes: the pulse laser, optical splitter and emission system set gradually；With
And the PIN detector being connected with the optical splitter；
The polarization optical detection system includes: sequentially connected reception system, four road Stokes photon Polarization Detection systems
System, photon counter data acquisition system and data processing system；Wherein, the PIN detector is adopted with the photon counter data
Collecting system is connected.
Preferably, further includes: the display system being connected with the data processing system.
Preferably, the pulse laser generation wavelength is the laser of 532nm.
Preferably, the four roads Stokes photon Polarization Detection system includes: three optical splitters, total reflection mirror, analyzings
Device, quarter-wave plate, half wave plate, the first Gm-APD, the 2nd Gm-APD, the 3rd Gm-APD, the 4th Gm-APD and letter
Number processor；
The signal that the reception system receives is divided into four road signals by three optical splitters, signal is by being all-trans all the way
It is incident to the first Gm-APD after penetrating the reflection of mirror, the first Gm-APD detects signal all the way, and two road signals pass through analyzer
Rise it is to the rear be incident to the 2nd Gm-APD, the 2nd Gm-APD detects two road signals, three road signals pass through quarter-wave
The transmission of piece and analyzer rise it is to the rear be incident to the 3rd Gm-APD, four road signals pass through the transmission and analyzing of half wave plate
Device rise it is to the rear be incident to the 4th Gm-APD, signal processor is according to the first Gm-APD, the 2nd Gm-APD, the 3rd Gm-APD and the
Four Gm-APD obtain echo-signal, and the echo-signal is input to the photon counter data acquisition system.
Preferably, the first Gm-APD, the 2nd Gm-APD, the 3rd Gm-APD and the 4th Gm-APD
Model are as follows:
The response process of each Gm-APD is divided into two parts, the first process be from photon to photoelectronic conversion process, this
When, transformation efficiency corresponding to system is the quantum efficiency of Gm-APD；Second process is that the process of snowslide, light are generated by photoelectron
It is η, the i.e. quantum efficiency of detector that son, which is converted into photoelectronic probability,；The probability that photoelectron can generate snowslide is 1, i.e., any
One electronics can generate a snowslide；
It is located under m-th of sampling interval, the average value of received signal number of photons is Ks[m], bias light subnumber
Average value is Kb, signal photoelectron number and background photoelectron number during corresponding second are respectively Ns[m] and
Nb, further include the dark current noise that device generates in the photoelectron number detected, be located in each sampling interval due to dark
Average electron number caused by current noise is Nd,
Then incident photoelectron number is
Wherein, for K (m) in the avalanche pulse number in the section m, M, which is represented, have passed through M measurement statistics, Nsn[i] is indicated i-th
Signal photoelectron number and the average value of noise photoelectron number sum in a sampling interval.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides a kind of accurately targets
Material Identification system is calculated the Stokes vector of reflection photon using the Photon count statistic that Gm-APD measurement obtains, passed through
The situation of change of Stokes vector achievees the purpose that target materials identify.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawing is the schematic diagram of accurately target materials identifying system provided by the invention；
Fig. 2 attached drawing is the schematic diagram of Stokes photon Polarization Detection system in four roads provided by the invention；
Fig. 3 attached drawing is the model schematic of Gm-APD provided by the invention；
The relation curve of the avalanche pulse number of Fig. 4 incoming signal photoelectron number and Gm-APD.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Inventor is studied in the scattering process to photon and atom, has analyzed the shadow of outgoing photon polarization direction
The factor of sound, it was demonstrated that the type of substance has an impact to outgoing photon polarization direction, is based on this, and the present invention provides a kind of using inclined
The method for information detection substance classes of shaking.
Referring to attached drawing 1, the embodiment of the invention discloses a kind of accurately target materials identifying systems, comprising: polarised light hair
Penetrate system and polarization optical detection system；
Wherein, polarized light emission system includes: the pulse laser 1, optical splitter 2 and emission system 3 set gradually；And
The PIN detector 4 being connected with optical splitter 2；
Polarization optical detection system include: sequentially connected reception system 5, four road Stokes photon Polarization Detection systems 6,
Photon counter data acquisition system 7 and data processing system 8；Wherein, PIN detector 4 and 7 phase of photon counter data acquisition system
Even.
In order to further optimize the above technical scheme, further includes: the display system 9 being connected with data processing system 8.
In order to further optimize the above technical scheme, 1 generation wavelength of pulse laser is the laser of 532nm.
Referring to attached drawing 2, in order to further optimize the above technical scheme, four road Stokes photon Polarization Detection systems 6 packet
It includes: three optical splitters 66, total reflection mirror 67, analyzer 68, quarter-wave plate 69, half wave plate 610, the first Gm-
APD11, the 2nd Gm-APD12, the 3rd Gm-APD13, the 4th Gm-APD14 and signal processor 15；Wherein, signal processor 15
It is connected with photon counter data acquisition system 7.
Reception system is connect into the signal that 5 receive by three optical splitters 66 and is divided into four road signals, signal is by being all-trans all the way
It is incident to the first Gm-APD11 after penetrating the reflection of mirror 67, the first Gm-APD11 detects signal all the way, and two road signals pass through
Analyzer 68 rise it is to the rear be incident to the 2nd Gm-APD12, the 2nd Gm-APD12 detects two road signals, three road signals warp
Cross quarter-wave plate 69 transmission and analyzer 68 rise it is to the rear be incident to the 3rd Gm-APD12, four road signals by two/
The transmission of one wave plate 610 and analyzer 68 rise it is to the rear be incident to the 4th Gm-APD14, signal processor 15 is according to the first Gm-
APD11, the 2nd Gm-APD12, the 3rd Gm-APD13 and the 4th Gm-APD14 obtain echo-signal, and echo-signal is input to
Photon counter data acquisition system 7.
Gm-APD detector have single photon response sensitivity, in addition to this, Gm-APD detector also have it is small in size,
It is light-weight, the characteristics of small power consumption, it is greatly improved the performance of photon counting, is also had just because of Gm-APD detector high
Response sensitivity, inevitable noise (including ambient noise and dark current noise) easily responds by it, to generate big
Amount false-alarm seriously affects it and measures quality.The present invention provides a cleverly scheme, there is correlation using echo-signal and
Noise signal does not have the difference of correlation, in photon counting, the signal that PIN detector measures is introduced, in photon counting
Stage filters out the false-alarm of noise generation, to obtain more accurate measurement result.
In order to further optimize the above technical scheme, the first Gm-APD11, the 2nd Gm-APD12, the 3rd Gm-APD13 and
The model of four Gm-APD14 are as follows:
The response process of each Gm-APD is divided into two parts, the first process be from photon to photoelectronic conversion process, this
When, transformation efficiency corresponding to system is the quantum efficiency of Gm-APD；Second process is that the process of snowslide, light are generated by photoelectron
It is η, the i.e. quantum efficiency of detector that son, which is converted into photoelectronic probability,.The probability that photoelectron can generate snowslide is 1, i.e., any
One electronics can generate a snowslide；
It is located under m-th of sampling interval, the average value of received signal number of photons is Ks[m], bias light subnumber
Average value is Kb, signal photoelectron number and background photoelectron number during corresponding second are respectively Ns[m] and
Nb, further include the dark current noise that device generates in the photoelectron number detected, be located in each sampling interval due to dark
Average electron number caused by current noise is Nd,
Then incident photoelectron number is
Wherein, for K (m) in the avalanche pulse number in the section m, M, which is represented, have passed through M measurement statistics, Nsn[i] is indicated i-th
Signal photoelectron number and the average value of noise photoelectron number sum in a sampling interval.
Referring to attached drawing 3, attached drawing 3 is the schematic diagram of Gm-APD model provided by the invention.In traditional Gm-APD application,
Gm-APD cannot respond to light intensity, and simple 0 and 1 response can only be carried out for the photon of arrival.But pass through benefit
With the statistical result of big measurement, it counter can be pushed into and penetrate photoelectron number, to obtain the light intensity of incident light.Therefore, it is necessary to Gm-
APD photon counting probability statistical model is studied, specific as follows:
The response process of Gm-APD is divided into two parts, and the first process is from photon to photoelectronic conversion process, at this point, being
The quantum efficiency that the corresponding transformation efficiency of system is Gm-APD；Second process is that the process of snowslide is generated by photoelectron, and photon turns
Turning to photoelectronic probability is η, the i.e. quantum efficiency of detector.Any one of the probability that photoelectron can generate snowslide is 1, i.e.,
Electronics can generate a snowslide；
It is located under m-th of sampling interval, the average value of received signal number of photons is Ks[m], bias light subnumber
Average value is Kb, signal photoelectron number and background photoelectron number during corresponding second are respectively Ns[m] and
Nb, further include the dark current noise that device generates in the photoelectron number detected, be located in each sampling interval due to dark
Average electron number caused by current noise is Nd,
Signal number of photons in m-th of sampling interval obeys Poisson distribution, its average value is Ks[m] has k light at this time
Son appears in the probability in m-th of sampling interval are as follows:
In the response process of Gm-APD, the probability-distribution function of the photoelectron number within m-th of sampling interval also meets
Therefore Poisson distribution has k signal photoelectron to appear in the probability in m-th of sampling interval are as follows:
Average signal number of photons and the quantum efficiency of average signal photoelectron number and detector have within m-th of sampling interval
It closes:
Ns[m]=ηqKs[m] (3)
In Gm-APD, noise is background noise and secret mark number, the probability-distribution function of these noise photoelectron numbers
Also Poisson distribution is obeyed,
Wherein NnIndicate the average noise photoelectron number in the sampling interval that time interval is Δ T:
Nn=Nb+Nd (5)
Due to two Poisson distributions and be also Poisson distribution, there is k signal and noise photoelectron to appear in the
The probability in m sampling interval can be described as:
N in formulasn[m] indicates signal photoelectron number and the average value of noise photoelectron number sum in m-th of sampling interval:
Nsn[m]=Ns[m]+Nn (7)
The position distribution that first time snowslide occurs is expressed as p1(m), therefore, first time snowslide is between first time
It can be indicated every the probability of interior generation are as follows:
If first time snowslide is that the probability occurred second sampling interval is:
If first time snowslide be before also meaning that in m to occurring in the sampling interval m-1 sampling interval avenge
The probability collapsed is zero, then the expression formula of probability at this time are as follows:
Assuming that have passed through M measurement statistics, the avalanche pulse number in the section m is K (m), then detection probability P (m) can be with
It is calculated
Then incident photoelectron number is
Fig. 4 gives as sampling interval m=30, for (N under different noise conditionsn=1MHz~8MHz), incidence letter
The relation curve of the avalanche pulse number of number photoelectron number and Gm-APD.
It, can be according to spy from analysis it may be concluded that the detection probability of Gm-APD has good gain response curve
The measurement of incident photoelectron number is realized in the measurement for surveying probability.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (5)
1. a kind of accurately target materials identifying system characterized by comprising polarized light emission system and polarization optical detection system
System；
Wherein, the polarized light emission system includes: the pulse laser, optical splitter and emission system set gradually；And with
The connected PIN detector of the optical splitter；
The polarization optical detection system includes: sequentially connected reception system, four road Stokes photon Polarization Detection systems, light
Sub-count data collection system and data processing system；Wherein, the PIN detector and the photon counter data acquisition system
It is connected.
2. accurately target materials identifying system according to claim 1, which is characterized in that further include: with the data
The display system that processing system is connected.
3. accurately target materials identifying system according to claim 1, which is characterized in that the pulse laser generates
Wavelength is the laser of 532nm.
4. accurately target materials identifying system according to claim 1, which is characterized in that four road stokes light
Sub- Polarization Detection system includes: three optical splitters, total reflection mirror, analyzer, quarter-wave plate, half wave plate, first
Gm-APD, the 2nd Gm-APD, the 3rd Gm-APD, the 4th Gm-APD and signal processor；
The signal that the reception system receives is divided into four road signals by three optical splitters, signal passes through total reflection mirror all the way
Reflection after be incident to the first Gm-APD, the first Gm-APD detects signal all the way, two road signals by analyzer rise
To the rear to be incident to the 2nd Gm-APD, the 2nd Gm-APD detects two road signals, and three road signals are by quarter-wave plate
Transmission and analyzer rise it is to the rear be incident to the 3rd Gm-APD, transmission and analyzer of the four road signals by half wave plate
Rise it is to the rear be incident to the 4th Gm-APD, signal processor is according to the first Gm-APD, the 2nd Gm-APD, the 3rd Gm-APD and the 4th
Gm-APD obtains echo-signal, and the echo-signal is input to the photon counter data acquisition system.
5. accurately target materials identifying system according to claim 4, which is characterized in that the first Gm-APD, institute
State the model of the 2nd Gm-APD, the 3rd Gm-APD and the 4th Gm-APD are as follows:
The response process of each Gm-APD is divided into two parts, and the first process is from photon to photoelectronic conversion process, at this point, being
The quantum efficiency that the corresponding transformation efficiency of system is Gm-APD；Second process is that the process of snowslide is generated by photoelectron, and photon turns
Turning to photoelectronic probability is η, the i.e. quantum efficiency of detector；Any one of the probability that photoelectron can generate snowslide is 1, i.e.,
Electronics can generate a snowslide；
It is located under m-th of sampling interval, the average value of received signal number of photons is Ks[m], the average value of bias light subnumber
For Kb, signal photoelectron number and background photoelectron number during corresponding second are respectively Ns[m] and Nb, institute
Further include in the photoelectron number of detection device generate dark current noise, be located in each sampling interval due to dark current noise
Generated average electron number is Nd,
Then incident photoelectron number is
Wherein, for K (m) in the avalanche pulse number in the section m, M, which is represented, have passed through M measurement statistics, Nsn[i] expression is adopted at i-th
Signal photoelectron number and the average value of noise photoelectron number sum in sample interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033856.3A CN109188456A (en) | 2018-09-05 | 2018-09-05 | A kind of accurately target materials identifying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033856.3A CN109188456A (en) | 2018-09-05 | 2018-09-05 | A kind of accurately target materials identifying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109188456A true CN109188456A (en) | 2019-01-11 |
Family
ID=64914791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811033856.3A Pending CN109188456A (en) | 2018-09-05 | 2018-09-05 | A kind of accurately target materials identifying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109188456A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0080540A1 (en) * | 1981-11-30 | 1983-06-08 | Leo Tumerman | Method and apparatus for measuring quantities which characterize the optical properties of substances |
| JP2002071463A (en) * | 2000-08-31 | 2002-03-08 | Sun Tec Kk | Polarization degree measuring device |
| US20130332115A1 (en) * | 2012-01-13 | 2013-12-12 | University Of Notre Dame Du Lac | Methods and apparatus for electromagnetic signal polarimetry sensing |
| CN105182351A (en) * | 2015-09-21 | 2015-12-23 | 哈尔滨工业大学 | Quantum polarization-based multidimensional information detection device and method |
| CN105911022A (en) * | 2016-06-06 | 2016-08-31 | 安徽大学 | Hazardous chemical substance remote sensing detection method and device based on wide tuning external cavity quantum cascade laser |
| CN106896371A (en) * | 2017-04-07 | 2017-06-27 | 哈尔滨工业大学 | A kind of atomic low light signals degree of polarization detection system and the detection method based on the system |
| CN107272020A (en) * | 2017-07-19 | 2017-10-20 | 哈尔滨工业大学 | Highly sensitive polarization lidar system based on Gm APD |
| CN107390230A (en) * | 2017-07-19 | 2017-11-24 | 哈尔滨工业大学 | Double Gm APD photon counting laser radars based on half time alignment door |
| US20180164413A1 (en) * | 2016-12-13 | 2018-06-14 | Sensl Technologies Ltd. | LiDAR Apparatus |
-
2018
- 2018-09-05 CN CN201811033856.3A patent/CN109188456A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0080540A1 (en) * | 1981-11-30 | 1983-06-08 | Leo Tumerman | Method and apparatus for measuring quantities which characterize the optical properties of substances |
| JP2002071463A (en) * | 2000-08-31 | 2002-03-08 | Sun Tec Kk | Polarization degree measuring device |
| US20130332115A1 (en) * | 2012-01-13 | 2013-12-12 | University Of Notre Dame Du Lac | Methods and apparatus for electromagnetic signal polarimetry sensing |
| CN105182351A (en) * | 2015-09-21 | 2015-12-23 | 哈尔滨工业大学 | Quantum polarization-based multidimensional information detection device and method |
| CN105911022A (en) * | 2016-06-06 | 2016-08-31 | 安徽大学 | Hazardous chemical substance remote sensing detection method and device based on wide tuning external cavity quantum cascade laser |
| US20180164413A1 (en) * | 2016-12-13 | 2018-06-14 | Sensl Technologies Ltd. | LiDAR Apparatus |
| CN106896371A (en) * | 2017-04-07 | 2017-06-27 | 哈尔滨工业大学 | A kind of atomic low light signals degree of polarization detection system and the detection method based on the system |
| CN107272020A (en) * | 2017-07-19 | 2017-10-20 | 哈尔滨工业大学 | Highly sensitive polarization lidar system based on Gm APD |
| CN107390230A (en) * | 2017-07-19 | 2017-11-24 | 哈尔滨工业大学 | Double Gm APD photon counting laser radars based on half time alignment door |
Non-Patent Citations (2)
| Title |
|---|
| 李慧君: ""光子偏振的理论研究及实验探测"", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
| 赵远等: "高灵敏度的光子偏振激光雷达系统", 《红外与激光工程》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106125053B (en) | Pulse Doppler radar polarization anti jamming method | |
| Cramer et al. | On the analysis of UWB communication channels | |
| CN101285715B (en) | Weak pulse luminous signs detection apparatus and method | |
| CN107015205B (en) | False target elimination method for distributed MIMO radar detection | |
| CN106019300A (en) | Laser ranging device and laser ranging method thereof | |
| CN108828548A (en) | A kind of three Parameter fusion data set construction methods based on fmcw radar | |
| CN108627812A (en) | A kind of laser radar atmospheric visibility measurement method and device | |
| CN108919224B (en) | Broadband radar target self-adaptive fusion detection method based on oblique symmetrical structure | |
| CN104502917B (en) | Regulate and control to strengthen the method and system of photon counting laser radar detection sensitivity using photon | |
| CN112859098B (en) | Photon number resolution measurement enhanced single-photon laser radar system and ranging method | |
| CN110007299A (en) | A kind of dim target detection tracking based on hybrid coordinate puppet spectral technology | |
| CN204009074U (en) | Comprehensive laser radar system | |
| CN107038436A (en) | A kind of high spectrum image object detection method based on tensor Spectral match filter | |
| CN104849707B (en) | Sea clutter suppression method based on multi-radar distributed detection | |
| US8854250B2 (en) | Off-diagonal element echo power estimator for polarization weather radar | |
| CN111323765A (en) | Satellite-borne photon counting laser radar echo signal processing and target extraction method | |
| Anderson et al. | Murchison Widefield Array rapid-response observations of the short GRB 180805A | |
| Monroe et al. | Self-triggered radio detection and identification of cosmic air showers with the OVRO-LWA | |
| CN205844166U (en) | A kind of device improving THz wave compressed sensing image quality based on double image element | |
| Bullett et al. | Application of Autoscala to ionograms recorded by the VIPIR ionosonde | |
| CN109188456A (en) | A kind of accurately target materials identifying system | |
| Baggenstoss | Processing advances for localization of beaked whales using time difference of arrival | |
| CN111272285A (en) | Polarization state measurement analyzer with high-speed real-time response | |
| Ball et al. | Intersite magnetic signals from lightning | |
| CN113552563B (en) | Method for analyzing correspondence between vertical measurement information and high-frequency ground wave radar clutter information |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190111 |